Shears.



e. w. THORSELL.

SHEARS APPLICATION FILED APR. 11, 1908.

Patented.Feb. 23, 1909.

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GUSTAV W. THORSELL, OF CHICAGO, ILLINOIS.

SHE ABS.

Specification of Letters Patent.

Patented Feb. 23, 1909.

Application filed April 11, 1908. Serial No. $26,430.

To all whom it may concern:

Be it known that I, GUSTAV W. THORSELL, a citizen of the United States,residin at Chicago, in the county of Cook and tate of Illinois, haveinvented a certain new and useful Improvement in Shears, of which thefollowing is a full, clear, concise, and exact description, referencebeing had to the accompanying drawings, forming a part of thisspecification.

My invention relates to shears, or scissors,

articularly to that class having detachable Blades the object of myinvention being to provide a stronger and more eflicient arrangement.

In the accompanying drawings, which illustrate my invention, Figure 1 isa view of a pair of shears partly open; Fig. 2 is an ed e view; Fig. 31s an inslde view of one of t e blades; Fig. is an inner view of ahandle base; Fig. 5 is a sectional view taken on plane 5, 5 Fi 2; Fig. 6is a sectional View taken on p ane 6, 6; Fig. 7 is a sectional viewtaken on plane 7, 7, Fig. 2, and Fig. 8 is a top view of a handle base.

The blades 5 are formed of thin sheet steel, which when soft can bereadily worked and which can be tempered to any desired de ree ofhardness. The general outline of a lade is the same as that of the bladeof an ordinary shears. The rear edge of the blank during formation isturned upwardl and inwardly to form thus a still, rigid bac 1. A section2 of the e%ge along the base of the blade is also turne upwardly andinwardly to be parallel with the part of the back along the base. Theremaining part of the front edge forms the cutting edge. Between theback and the cutting edge, there is formed a stifi ening rid e or rib 5,which may be placed in the mos suitable position to give the requiredstrength and stiflness. The base edge 6 of the blade is V-shapedandpointed, and through the base there is a pivot hole 7. There may be anynumber of these stiffening ribs, dependin more or less u on the size ofthe blade, an the thickness oi the metal used will also vary with thesize. This blade, as described, can be stamped integral from the softsheet steel with very fewo rations and when tempered is very rigi andstrong.

In the particular shears shown, both blades may be alike and the handleparts may also be alike. Each handle art, as shown, comprises a grip arm8 an a base plan part 9. The base part is flat and in its outer edgesare the parallel channels or rooves 10 and 11. The inner end 12 of thease part is V-shaped, as shown, to correspond with the V-shaped end ofthe blade. Through the base part, there is also the pivot opening 13 forreceivin a pivot mech anism which will be describe later. When the bladeis applied to the base part, the inturned ends 14 and 15 of the flan earts 2 and 3 enter the slots 10 and 11 and t e V- shaped end 6 isbrought into register with the V-shaped end 12 and against the base ofthe grip part 8. Pivot openings 7 and 13 also go into register. Tofurther assist in holding the parts rigidly together, a short groove 16may be formed at the inner edge of the base part for receiving the baseend 17 of the rib 5. In this manner, the blade is firmly and rigidlyheld to the base part.

The pivot mechanism is most plainly shown in Figs. 5 and 6. A pivotscrew has the head or flange 18, the cylindrical shank art 19 and thethreaded end 20 of reduced iameter. The pivot opening 13 of the shearmember at the head end of the pivot screw is circular, and this shearmember will rotate about the screw shank. The pivot hole in the othershear member has a tongue or key 21 for engaging in a slot or key way 22formed in the screw shank so that the screw will turn with this shearmember. The threaded end 20 is engaged by the knurled nut 23. This nuthas locking teeth 24 cut in its enga ing edge for enga 'ng with thelocking en or point 25 of a 100 ing spring 26. This 5 ring is disposedin a groove 27, in whic it is fastened by the screw 28. The lockin point25 of the sprin extends in the path 0? the locking teeth and when thenut has been turned, to obtain the desired adjustment between the shearmembers, this locking point engages between the teeth and locks the nutin position so that the adjustment will be retained. The pivot screw,the nut and the shear member enga ed by the nut are thus relativelyimmovab e, the other shear member rotating about the shank of the screw.The shear member engaged by the nut is referably the top shear member,particu arly in barbers shears, to prevent the catching of hair in thenut. Very fine adjustment can be obtained with this pivot arrangement,and the nut being always looked against loosening, the adjustment willbe maintained.

The blades, of course, can be made of an size and of any thickness ofmetal, depen ing upon the size of the shears. In tailors shears, forexample, the blades would have to be much larger and of heavier stock.More strength in the ribs would also be necessary and the blade membersof the shears would also be different. The general construction,however, particularly the connection of the blades with the handlebases, will be the same as that described with reference to the shearsshown on the drawing.

I desire to secure the following claims for United States LettersPatent:

1. In a pair of shears having detachable blades, the combination of ahandle part having parallel grooves or channels in its side edges, and ablade having tongues or flanges for engaging said grooves or channels.

2. In a pair of shears, the combination of a handle part and adetachable blade part, said blade part being formed of sheet materialand having two parallel flanges, the handle part having grooves orchannels in its side edges for receiving the flanges of the blade.

3. In a pair of shears, the combination of handle parts and detachableblades, each blade being stamped integral from sheet steel, inturnedarallel flan es at the base of each blade, the edges of t e base part ofeach handle part being provided with slots for receiving the flanges ofthe associated blade, and a pivot member passing throu h the handle baseparts and the bases of t%e blades.

4. In a pair of shears, the combination of a handle part and detachableblade, said blade bein stamped integral from sheet material, tl ie rearedge of the blade being turned u wardly and inwardly to form a rigid bacthe other ed e at the base of the blade being also turne upwardly andinwardly parallel with the part of the back at the base, the remainingfront edge formin the cutting edge, the handle comprising a ase part anda rip arm, said base art having parallel si e edges, each provided witha groove or slot, the inwardly turned edges at the base of the bladepart engaging in said slots or grooves to rigidly secure the blade tothe handle part.

5. In a pair of shears, the combination of a handle part and detachableblade, said blade being stamped integral from sheet material, the reared e of the blade being turned upwardly an inwardly to form a rigidback, the other ed e at the base of the blade being also turne upwardlyand inwardly parallel with the part of the back at the base, theremainin front edge formthe cutting edge, the andle comprising a asepart and a' rip arm, said'base art having parallel si e edges, eachprovided with a groove or slot, the inwardly turned edges at the base ofthe blade part engaging in said slots or grooves to rigidly secure theblade to the handle part, and a strengthening rib or ribs formed in theblade between the back and cutting edge.

6. In a pair of shears, the combination of the shear members, eachcomprising a handle part and a detachable blade part, a pivot screwpassing through all the parts, one of the shear members being keyed. tothe pivot screw, the other member being free to rotate thereon, a nutengagin the end of the ivot screw, teeth cut into the lower edge of saidnut, and a locking spring secured at one end to the adjacent shearmember and having a locking point at its other end for engaging betweenthe teeth to thereby lock the nut to maintain adjustment between theshear members.

7 In a pair of shears, the combination of handle members and detachableblades therefor, each handle part com rising a base part and a grippingarm, the ase parts having paralle side edges, each provided with achannel or groove, the blades being stamped integral from sheetmaterial, the rear edge of each blade being turned upwardly and inwardlto form an inturned flange, the front e ge at the base part of the bladebeing also turned upwardly and inwardly to form a flange opposite andparallel to the flange at the back of the blade, the remainder of thefront edge of the blade forming the cutting edge, said opposite flan esengaging in the grooves or channels of t e corresponding handle basepart, the rear ends of the handle bases and of the blade bases beingV-shaped and coming into register when the blades are applied, a pivotscrew passing through the base parts of the hanles and blades, anadjusting nut for engaging the screw locking means for holding said nutin adjusted position, and strengthening ribs or ridges formed in theblades.

8. In a pair of shears, the combination of a handle part, a detachableblade formed integral of sheet material, the rear edge of said bladebeing turned upwardly and inwardly to form a rigid back, the front edgeof the blade forming the cutting ed e, a strengthening rib formed in thebla e between the back and the cuttin edge, and a groove at the edge ofthe han e part for receiving the end of the rib.

9. In a pair of shears, the combination of a handle part, a detachableblade for the handle part formed integral from sheet metal, the rearedge of the blade being turned 11 wardly and inwardly to form a rigidbae r, the front edge of the blade formin a cutting edge, a groove orchannel in a si e edgeof the handle art for receiving the in-turned edgeof the ack of the blade, and a pivot screw passing through the body partand blade to assist in holding the blade to the body part.

10. In a pair of shears, the combination of a handle part, a detachableblade for the handle part formed integral from sheet metal, the rearedge of the blade being turned upwardly and inwardly to form a rigidback, the front edge of the blade forming a cuttin edge, a roove orchannel in a si e edge 0 the ban le part for receiving the in-turnededge of the back of the blade, a

longitudinal strengthening rib stamped in the blade upon formationthereof, and a groove at the front edge of the body part for receivingthe end of the strengthemng rib. 15

In Witness whereof, I hereunto subscribe my name this 8th day of April,A. D. 1908.

GUSTAV W. THOR SELL.

Witnesses:

CHARLES J. SCHMIDT, GEORGE E. HIGHAM.

